Refactor SecurityStateModel/Clients for simplicity and reusability.

ios/chrome/browser/ssl/ios_chrome_security_state_model_client.mm

-// Copyright 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "ios/chrome/browser/ssl/ios_chrome_security_state_model_client.h"
-
-#include "base/command_line.h"
-#include "base/metrics/field_trial.h"
-#include "base/metrics/histogram_macros.h"
-#include "ios/web/public/navigation_item.h"
-#import "ios/web/public/navigation_manager.h"
-#import "ios/web/public/origin_util.h"
-#include "ios/web/public/security_style.h"
-#include "ios/web/public/ssl_status.h"
-#include "ios/web/public/web_state/web_state.h"
-#include "net/cert/x509_certificate.h"
-
-DEFINE_WEB_STATE_USER_DATA_KEY(IOSChromeSecurityStateModelClient);
-
-IOSChromeSecurityStateModelClient::IOSChromeSecurityStateModelClient(
-    web::WebState* web_state)
-    : web_state_(web_state),
-      security_state_model_(new security_state::SecurityStateModel()) {
-  security_state_model_->SetClient(this);
-}
-
-IOSChromeSecurityStateModelClient::~IOSChromeSecurityStateModelClient() {}
-
-void IOSChromeSecurityStateModelClient::GetSecurityInfo(
-    security_state::SecurityStateModel::SecurityInfo* result) const {
-  return security_state_model_->GetSecurityInfo(result);
-}
-
-bool IOSChromeSecurityStateModelClient::UsedPolicyInstalledCertificate() {
-  return false;
-}
-
-bool IOSChromeSecurityStateModelClient::IsOriginSecure(const GURL& url) {
-  return web::IsOriginSecure(url);
-}
-
-void IOSChromeSecurityStateModelClient::GetVisibleSecurityState(
-    security_state::SecurityStateModel::VisibleSecurityState* state) {
-  web::NavigationItem* item =
-      web_state_->GetNavigationManager()->GetVisibleItem();
-  if (!item || item->GetSSL().security_style == web::SECURITY_STYLE_UNKNOWN) {
-    *state = security_state::SecurityStateModel::VisibleSecurityState();
-    return;
-  }
-
-  state->connection_info_initialized = true;
-  state->url = item->GetURL();
-  const web::SSLStatus& ssl = item->GetSSL();
-  state->certificate = ssl.certificate;
-  state->cert_status = ssl.cert_status;
-  state->connection_status = ssl.connection_status;
-  state->security_bits = ssl.security_bits;
-  state->displayed_mixed_content =
-      (ssl.content_status & web::SSLStatus::DISPLAYED_INSECURE_CONTENT) ? true
-                                                                        : false;
-}